Steam-boiler



UNITED STATES PATENT OFFICE.

GEO. XV. BAINS, OF NElVBURGI-I, NEW YORK.

STEAM-BOILEB..

Speccaton of Letters Patent No. 29,615, dated August 14, 1860.

To all 'whom t may concer/n:

Be it known that I, GEORGE lV. BAINS, of Newburgh, in the county ofOrange and State of New York, have invented a new and ImprovedSteam-Boiler; and I do hereby declare that the following is a full,clear, and exact description of the same, reference being had to theaccompanying drawings, forming part of this specification, in which-Figure l, is a central vertical section of my improved boiler. Fig. 2 isa horizontal section of the same in the plane indicated by the line w,of Fig. 1.

Similar letters of reference indicate corresponding parts in the severalgures.

The object of this invention is to obtain a very cheap simple and strongsteam boiler of as small a size as may be desired capable of using fuelvery economically, and to this end it consists in a boiler composed of alower annular water chamber, and an upper annular water and steamchamber, connected by two or more concentric circular series of uprightwater tubes the inner series of which have bars arranged between them,extending from their bottoms where the grate is placed, nearly to thetop thereof, to form a central circular lire box and the outer series ofwhich are surrounded by a curtain like cylinder extending from thebottom of the upper steam and water chamber nearly to the lower waterchamber, and the whole being surrounded by an iron casing with which thechimney is connected all substantially as hereinafter described.

A, is the lower water chamber of annular form whose central opening c,constitutes an ash pit and draft hole.

B, is the upper water and steam chamber, of` the same external diameteras A, and whose central opening I), constitutes a feed hole which is tobe fitted with. a door or lid at the top to be opened for supplying thefuel.

O, C, and D, D, are two concentric circular series of water tubesconnecting the chambers A, and B, the inner series O, O, being arrangednot far from the central openings a, b, and the outer series D, D, aboutmidway between O, C, and the exteriors of the chambers A, B. The`chamber A, the tubes O, C, and D, D, and the lower portion of thechamber B, constitute water space, and the upper portion of the chamberB, constitutes steam space. The chambers A, and B, may be made of stoutcast iron, the bottom c, of the lower chamber A, and the top (l, of theupper chamberB, being composed of separate plates which are bolted orscrewed to flangese, and f, formed around the bottom and top of theirrespective chambers. These flanges are represented as projectingoutwardly from the bodies of the chambers see Fig. l, but they may bearranged to project in the opposite directions.

E, is the grate, of circular form arranged concentrically about ornearly on a level with the top of the lower chamber' A. This grate maybe hung on pivots like the grates of most stoves for the purpose ofenabling it to be shaken to stir the fire.

F, F, .are the upright bars arranged between the tubes C, C,constituting the inner series and combining with the lower parts of thesaid tubes to constitute the lire box. The innerfaces of the said barsare of such width as to enable them to rest against the inner sides ofthe tubes but to leave nearly half of the tubes exposed to the directaction of the radiant heat of the fire on the grate and to the ascendingflame and heated gaseous products of combustion. These bars rest uponthe top of the lower chamber A, and ext-end about three fourths of theway up the said tubes and may be so constructed that their own weighttends to hold them out against the tube-s, which construction enablesthem to be inserted and drawn out through the opening b, in the upperchamber B.

G, is the curtain like cylinder which surrounds closely the outer seriesof tubes D, D. This cylinder which may be of sheet iron is attached tothe bottom of the upper chamber B, and extends about three fourths ofthe distance to the top of the lower chamber A.

H, is the outer casing surrounding the two chambers A, B, and the tubes,fitting closely around the top of the upper and bottom of the lowerchamber and close between the outer flanges of the said chambers; or ifthe chambers have inner flanges for the att-achment of the plates c, andd, they should have small flanges or proj ecting Vrims to abut againstthe ends of the said cylinder H. The exteriors of the chambers should bemade slightly conical to leave spaces between them and the cylinder H,as shown in Fig. 1.

I, is the chimney connected with one sideA posed inner sides of thetubes C, C, and the i interior of the opening in the upper cylinder,over the tops of the bars F, F, and between and around the upper partsof the said tubes C, C, and D, D, under the curtain like cylinder G, incontact with the top of the lower chamber and bottom of the upper oneand upward between the cylinders G, and H, and around the exterior ofthe chambers A, B, and escape by the chimney. The whole of the chambersA, and B, with the exception of the top plate CZ, of the latter and thebottom plate c, of the former, the Whole of the tubes D, D, and thewhole of the tubes C, C, with the exception of the parts in contact withthe bars F, F, present themselves to the contact of the iame and heatedgaseous products of combustion while a very large portion of the tubesC, C, and a portion of the upper chamber A, present themselves to theradiant heat of the body of incandescent fuel upon the grate, and hencethe fire flame and gases act upon a very extensive and efective heatingsurface thus producing a very rapid generation of steam` which collectsin the upper part of the chamber B, whilea very complete and perfectcirculation of water is produced in an upward direction in the hottertubes C, C, and in a downward direction in the cooler tubes D, D. Inboilers of considerable size an intermediate concentric series of tubesmay be applied in a similar manner between C, C, and D., D, and in suchcase the curtain like cylinder G, maybe arranged either between theintermediate and outer series of tubes, or outside of the outer seriesas represented. Four or more iron bolts may be employed to secure theupper and lower chambers together and such bolts should preferably passeach through one of the tubes so that they may expand as nearly aspossible in the same degree as the tubes.

What I claim as my invention, and desire to secure by Letters Patent,is-

The combination of the upper and lower annular chambers A, B, connectedby two or more series of water tubes C, C, D, D, the bars F, F, or otherfilling between the inner tubes, the curtain like cylinder G, and theouter casing H, t-he Whole arranged substantially as herein specified.

GEO. W. BAINS.

Witnesses:

LOUIS H. BLACKMAN, ELI H. EVANS.

